[llvm] r287203 - [AMDGPU] Custom lower f16 = fp_round f64

[Galina Kistanova via llvm-commits]

Hi Konstantin,

This revision added warnings to the builder:
http://lab.llvm.org:8011/builders/clang-3stage-ubuntu/builds/330

Please have a look at this?

Thanks

Galina



On Wed, Nov 16, 2016 at 8:28 PM, Konstantin Zhuravlyov via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> Author: kzhuravl
> Date: Wed Nov 16 22:28:37 2016
> New Revision: 287203
>
> URL: http://llvm.org/viewvc/llvm-project?rev=287203&view=rev
> Log:
> [AMDGPU] Custom lower f16 = fp_round f64
>
> Modified:
>     llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp
>     llvm/trunk/lib/Target/AMDGPU/SIISelLowering.h
>
> Modified: llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/
> AMDGPU/SIISelLowering.cpp?rev=287203&r1=287202&r2=287203&view=diff
> ============================================================
> ==================
> --- llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp (original)
> +++ llvm/trunk/lib/Target/AMDGPU/SIISelLowering.cpp Wed Nov 16 22:28:37
> 2016
> @@ -285,6 +285,7 @@ SITargetLowering::SITargetLowering(const
>      AddPromotedToType(ISD::STORE, MVT::f16, MVT::i16);
>
>      // F16 - VOP1 Actions.
> +    setOperationAction(ISD::FP_ROUND, MVT::f16, Custom);
>      setOperationAction(ISD::FCOS, MVT::f16, Promote);
>      setOperationAction(ISD::FSIN, MVT::f16, Promote);
>      setOperationAction(ISD::FP_TO_SINT, MVT::f16, Promote);
> @@ -1832,6 +1833,8 @@ SDValue SITargetLowering::LowerOperation
>
>    case ISD::ConstantFP:
>      return lowerConstantFP(Op, DAG);
> +  case ISD::FP_ROUND:
> +    return lowerFP_ROUND(Op, DAG);
>    }
>    return SDValue();
>  }
> @@ -2043,6 +2046,23 @@ SDValue SITargetLowering::lowerConstantF
>    return SDValue();
>  }
>
> +SDValue SITargetLowering::lowerFP_ROUND(SDValue Op, SelectionDAG &DAG)
> const {
> +  EVT DstVT = Op.getValueType();
> +  EVT SrcVT = Op.getOperand(0).getValueType();
> +
> +  assert(DstVT == MVT::f16 &&
> +         "Do not know how to custom lower FP_ROUND for non-f16 type");
> +
> +  if (SrcVT != MVT::f64)
> +    return Op;
> +
> +  SDLoc DL(Op);
> +  SDValue Src = Op.getOperand(0);
> +  SDValue FpToFp16 = DAG.getNode(ISD::FP_TO_FP16, DL, MVT::i32, Src);
> +  SDValue Trunc = DAG.getNode(ISD::TRUNCATE, DL, MVT::i16, FpToFp16);
> +  return DAG.getNode(ISD::BITCAST, DL, MVT::f16, Trunc);;
> +}
> +
>  SDValue SITargetLowering::getSegmentAperture(unsigned AS,
>                                               SelectionDAG &DAG) const {
>    SDLoc SL;
>
> Modified: llvm/trunk/lib/Target/AMDGPU/SIISelLowering.h
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/
> AMDGPU/SIISelLowering.h?rev=287203&r1=287202&r2=287203&view=diff
> ============================================================
> ==================
> --- llvm/trunk/lib/Target/AMDGPU/SIISelLowering.h (original)
> +++ llvm/trunk/lib/Target/AMDGPU/SIISelLowering.h Wed Nov 16 22:28:37 2016
> @@ -56,6 +56,9 @@ class SITargetLowering final : public AM
>    /// \brief Custom lowering for ISD::ConstantFP.
>    SDValue lowerConstantFP(SDValue Op, SelectionDAG &DAG) const;
>
> +  /// \brief Custom lowering for ISD::FP_ROUND for MVT::f16.
> +  SDValue lowerFP_ROUND(SDValue Op, SelectionDAG &DAG) const;
> +
>    SDValue getSegmentAperture(unsigned AS, SelectionDAG &DAG) const;
>    SDValue lowerADDRSPACECAST(SDValue Op, SelectionDAG &DAG) const;
>    SDValue lowerTRAP(SDValue Op, SelectionDAG &DAG) const;
>
>
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